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Each dated version is a frozen contract: once cut, its response and request shapes never change under you. This page lists what changed relative to the version before it. Entries are newest first.
This is the human-readable version. GET /spec/versions lists the supported versions machine-readably, and each version’s full shape is at /spec/<date>. See API Versions for the header itself.

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2026-07-01

Adds the FedNow deposit rail. The deposit_rails array can now include a FedNow member, for autoramps whose deposit account supports FedNow. This is additive to the DepositRail union: every existing member (Iban, AchWire, Swift, and the rest) is unchanged.
If your integration matches on deposit_rails with an exhaustive switch and no default case, add a FedNow branch before sending X-API-Version: 2026-07-01. Callers on 2025-03-13 never see this variant, so there is no rush to migrate.

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2025-03-13

Initial version. Served when no X-API-Version header is sent.